Universal joint



FIG. 1 is a perspective view of the universal joint, embodying the new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view of the universal joint of FIG. 1, the opposite back view is a mirror image thereto; and,

FIG. 5 is a left side view of the universal joint of FIG. 1, the opposite right side view is a mirror image thereto.

The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a universal joint, as shown and described. 